webm audio works a treat to compress audio in my songbook app, and is great on Android 10. However, testing on an Android 6.0.1 device (Lenovo TB-X103F ARM 32), when I hit the play button, nothing happens.
This device can play standalone webm audio files.
@Phil_M, In the upcoming SAB 9.1, we use a different audio player for WebM files which should work much better (and down to Android 4.1). When it is released, please try and let me know.